This book is based on the assumption that the development of science has to be understood both as a social and as an intellectual process. The division between internal and external history, between history of ideas and sociology of science, has been harmful not only to our understanding of scientific rationality but also to our understanding of the social processes of scientific development. Just as philosophy of science must be informed by its history, so also must sociology of science be both historically and philosophically informed. Proceeding on this assumption, I examine in detail the...